Guosmilesmile opened a new pull request, #3692:
URL: https://github.com/apache/fluss/pull/3692

   ## Description
   
   ### Problem
   
   The `lake` stage in CI (defined in `ci-template.yaml`) ran 6 sub-modules 
sequentially in a single Maven command:
   
   | Sub-module | Duration |
   |---|---|
   | fluss-lake (parent) | ~0 min |
   | fluss-lake-paimon | ~5 min |
   | fluss-lake-iceberg | ~5 min |
   | fluss-lake-lance | ~1 min |
   | fluss-flink-1.19 | ~24 min |
   | fluss-flink-1.18 | ~23 min |
   | **Total** | **~60 min** |
   
   This consistently triggered the step-level `timeout-minutes: 60` limit, 
causing the job to fail with:
   
   ```
   Error: The action 'Test' has timed out after 60 minutes.
   ```
   
   ### Solution
   
   Split the `lake` stage into two independent jobs that run in parallel via 
the GitHub Actions matrix:
   
   - **`lake`**: fluss-lake, fluss-lake-paimon, fluss-lake-iceberg, 
fluss-lake-lance (~12 min)
   - **`flink-backward`**: fluss-flink-1.19, fluss-flink-1.18 (~47 min)
   
   Since both jobs run in parallel (`fail-fast: false`), the wall-clock time 
drops from ~60 min to ~47 min, well within the timeout.
   
   ### Changes
   
   - `stage.sh`: Added `STAGE_FLINK_BACKWARD` / `MODULES_FLINK_BACKWARD`, split 
Flink 1.18/1.19 out of `MODULES_LAKE`, updated `get_test_modules_for_stage()` 
with new case and updated `core` negation.
   - `ci-template.yaml`: Added `flink-backward` to the matrix.
   


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